A boat travels upstream and after one hour has gone 10 km. The boat next travels downstream and after one hour has gone 18 km. If the boat's speed relative to the water is constant, what is the speed of the current in the river?
a. 3 km/h
b. 4 km/h
c. 5 km/h
d. 6 km/h
e. 7 km/h
b
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As a star exhausts hydrogen in its core, it
a. becomes hotter and more luminous b. becomes hotter and less luminous c. becomes cooler and less luminous d. becomes larger in radius and hotter
How is the age of the galaxy determined?
a. measuring the metallicity of Population II stars b. finding the turnoff point in the H-R diagram of globular clusters c. from the motion of stars in the galactic halo d. counting the number of open clusters in the spiral arms
In an adiabatic process:
A. the energy absorbed as heat equals the work done by the system on its environment B. the energy absorbed as heat equals the work done by the environment on the system C. the absorbed as heat equals the change in internal energy D. the work done by the environment on the system equals the change in internal energy E. the work done by the system on its environment equals to the change in internal energy
A wheel accelerates from rest to at a uniform rate of 58 rad/s2. Through what angle (in radians) did the wheel turn while accelerating?
A) 30 rad B) 24 rad C) 60 rad D) 38 rad